1 files changed, 5 insertions, 0 deletions
diff --git a/random.c b/random.c
index 86c8198d41..b04bcddb8f 100644
--- a/random.c
+++ b/random.c
@@ -215,6 +215,11 @@ rb_f_rand(argc, argv, obj)
 	vmax = rb_dbl2big(RFLOAT(vmax)->value);
 	/* fall through */
       case T_BIGNUM:
+	vmax = rb_big_norm(vmax);
+	if (FIXNUM_P(vmax)) {
+	    max = FIX2INT(vmax);
+	    break;
+	}
       bignum:
         {
 	    long len = RBIGNUM(vmax)->len;